6815121473 has 2 divisors, whose sum is σ = 6815121474. Its totient is φ = 6815121472.

The previous prime is 6815121433. The next prime is 6815121487. The reversal of 6815121473 is 3741215186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6673582864 + 141538609 = 81692^2 + 11897^2 .

It is a cyclic number.

It is not a de Polignac number, because 6815121473 - 2¹⁰ = 6815120449 is a prime.

It is not a weakly prime, because it can be changed into another prime (6815121413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3407560736 + 3407560737.

It is an arithmetic number, because the mean of its divisors is an integer number (3407560737).

Almost surely, 2^6815121473 is an apocalyptic number.

It is an amenable number.

6815121473 is a deficient number, since it is larger than the sum of its proper divisors (1).

6815121473 is an equidigital number, since it uses as much as digits as its factorization.

6815121473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 6815121473 is about 82553.7489942159. The cubic root of 6815121473 is about 1895.9397573578.

The spelling of 6815121473 in words is "six billion, eight hundred fifteen million, one hundred twenty-one thousand, four hundred seventy-three".